The structure of C-type Rhizoma Dioscorea starch granule revealed by acid hydrolysis method |
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| Authors: | Yu Jinglin Wang Shujun Jin Fengmin Liya Sun Jiugao Yu |
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| Affiliation: | 1. College of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, Tianjin 300072, China;2. School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China;3. School of Chemical Engineering, Tianjin University, Tianjin 300072, China;4. Hebei Yiling Academy of Medicine, Shijiazhuang 050035, China;5. College of Science, Department of Chemistry, Tianjin University, Tianjin 300072, China |
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| Abstract: | Scanning electron microscope (SEM), X-ray powder diffraction (XRD) and cross polarisation/magic-angle spinning (CP/MAS) 13C nuclear magic resonance (NMR) have been used for the structural characterisation of C-type starch granule during acid hydrolysis. SEM shows that the amorphous areas mainly locate the core part of C-type starch granules, while the crystalline areas mainly exist in the peripheral region of starch granules. XRD analysis reveals that the B-type polymorph present in the C-type starch granule are preferentially degraded or degraded faster than the A-type polymorph. NMR spectra confirm that the amorphous regions in the starch granules are firstly hydrolysed and could be hydrolysed completely as long as the hydrolysis time is sufficient. After 40 days of hydrolysis, the acid-modified starch shows typical A-type characteristics upon analysis of the XRD pattern or the 13C CP/MAS NMR spectra. |
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| Keywords: | Starch Acid hydrolysis Morphology Crystallinity Particle size distribution |
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